Pulverized-fuel burner



'July 10, 1928.

w. R. WOOD PULVERIZED FUEL BURNER Filed Feb. 1. 1926 INVENTOR [%g M ATTORNEYs Patented July 10, 1928.

'FFICE.

TE-NT WILFRED R. WOOD, OF LONDON, ENGLAND, ASSIGNOR TO INTERNATIONALCOMBUS- TION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATIONOli DELAWARE.

PULVERIZED-FUEL BURNER.

Application filed February This invention relates to burners forpulverized fuel furnaces and particularly to that type of burner whichis arranged to discharge the incoming stream of fuel and air in theshape of a spirally whirling hollow cone.

The principal object of the invention is to provide a burner of thistype which can be adjusted so as to alter the discharge area i0 andthereby prevent operational impairment during changes in furnacecapacity.

Heretofore, in burners of this type, it has been impossible to maintainthe proper swirling action at varying furnace capacities or a constantvelocity at which the fuel enters the furnace. This difficulty hasarisen because of the fact that the spiral blades necessary to impartthe swirling action have not permitted any alteration or no adjustmentof the area of the discharge opening.

More specifically considered, therefore,.it is the object of myinvention to provide a burner of the character described with which itis possible to maintain a constant swirling action at various furnacecapacities; to maintain a constant velocity at which the fuel enters;and to maintain a constant centrifugal force for spreading the particlesof coal as they enter the furnace. I also provide a burner which willkeep the coal in suspension even at low furnace capacities.

I attain the foregoing ob'ects and others which may appear hereina or orare 1ncident to my invention by means of a construction which isillustrated in the preferred form in the accompanying drawing, wherein:Fig. 1 is a vertical longitudinal section through my improved burnershowing the adjacent i e connections for the entry of pulverize uel andair, and I Fig. 2 is a section on the line of Tn the drawing the humoris shown extending thru the furnace wall 1. It comprises an outer shell2 and an'inner cone 3 which have their adjacent sides substanto tially,parallel as shown with the outward fiare toward the point'of dischargeinto the furnace.

The outer shell is provided with spiral 1, 1926. Serial No. 85,098.

vanes 4 which project inwardly toward the cone and the cone itself isprovided with similar vanes 5 projecting outwardly toward the vanes onthe shell with which they cooperate to give the fuel a swirling actionas it enters the furnace.

'A rod 6 is connected to therear end of the cone 3. This rod lies withinthe air conduit 7 in which it is supported by means of the spiders 8.Movement of the cone 3 axially of the burner is effected thru the mediumof the rod 6 and the bell crank handle 9. The pulverized fuel isintroduced thru the conduit 10.

By moving the cone to the left within the shell 2 it will be seen thatthe discharge area will be decreased and vice versa. During adjustmentthe spiral vanes will coact to rotate the cone since the vanes arearranged to overlap as clearly shown in Fig. 2. The vanes therefore, soto speak, are spirally telescopic.

By providing both the cone and shell with vanes which overlap truespiral channels are provided in all positions of adjustment of theburnerby virtue of which efiective swirling action is maintained underall operating conditions.

By means of the construction shown I am enabled to adjust the burner tomeet different furnace capacities. When it' is not desired to use thefurnace at full capacity the burner opening, of course, should besmaller in order to correspond to the reduced amount of fuel.Heretofore, in burners of this type, it has not been possible to obtainefl'ective swirling action, and, therefore, a constant centrifugal forcefor spreading the particles of coal as they enter the furnace was notobtained. Through the practice of my invention efi'ective swirlingaction is maintained whereby the fuel is'kept in suspension, with theresult that fuel does not have a tendency to settle out at lowcapacities. Y

I claim 1. A pulverized fuel burner comprising in combination, a flaringshell, an inner cone mounted for rotation and arranged with sidesparalleling the shell sides and axially movable to vary the dischargearea'between shell and 'cone, spiral vanes extending iii- 95 wardly fromthe-shell a portion of the distance to the cone, and similar vanesextend the shell a portion of the distance to the 10 ing outwardly fromthe cone to cooperate cone, similar vanes extending outwardly with saidfirst vanes in directing the fueL- from the cone to cooperate with saidvfirst 2. A pulverized fuel burner comprising in, vanes in directing thevfuel, and means for combination, a shell flaring outwardly toaxiallyvarying the relation between shell ward the point of discharge,'arotatable and and cone to alter the discharge area. 15 axially movablecentral cone-like member In testimony whereof, I have hereunto withsides substantially parallel to the shell signed my name. sides, spiralvanes extending inwardly from WILFRED R. WOOD.

